sys/netipsec/ipsec.c

   1 /*      $FreeBSD$       */
   2 /*      $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
   3
   4 /*-
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * IPsec controller part.
  35  */
  36
  37 #include "opt_inet.h"
  38 #include "opt_inet6.h"
  39 #include "opt_ipsec.h"
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/malloc.h>
  44 #include <sys/mbuf.h>
  45 #include <sys/domain.h>
  46 #include <sys/protosw.h>
  47 #include <sys/socket.h>
  48 #include <sys/socketvar.h>
  49 #include <sys/errno.h>
  50 #include <sys/time.h>
  51 #include <sys/kernel.h>
  52 #include <sys/syslog.h>
  53 #include <sys/sysctl.h>
  54 #include <sys/proc.h>
  55
  56 #include <net/if.h>
  57 #include <net/route.h>
  58
  59 #include <netinet/in.h>
  60 #include <netinet/in_systm.h>
  61 #include <netinet/ip.h>
  62 #include <netinet/ip_var.h>
  63 #include <netinet/in_var.h>
  64 #include <netinet/udp.h>
  65 #include <netinet/udp_var.h>
  66 #include <netinet/tcp.h>
  67 #include <netinet/udp.h>
  68
  69 #include <netinet/ip6.h>
  70 #ifdef INET6
  71 #include <netinet6/ip6_var.h>
  72 #endif
  73 #include <netinet/in_pcb.h>
  74 #ifdef INET6
  75 #include <netinet/icmp6.h>
  76 #endif
  77
  78 #include <netipsec/ipsec.h>
  79 #ifdef INET6
  80 #include <netipsec/ipsec6.h>
  81 #endif
  82 #include <netipsec/ah_var.h>
  83 #include <netipsec/esp_var.h>
  84 #include <netipsec/ipcomp.h>            /*XXX*/
  85 #include <netipsec/ipcomp_var.h>
  86
  87 #include <netipsec/key.h>
  88 #include <netipsec/keydb.h>
  89 #include <netipsec/key_debug.h>
  90
  91 #include <netipsec/xform.h>
  92
  93 #include <machine/in_cksum.h>
  94
  95 #ifdef IPSEC_DEBUG
  96 int ipsec_debug = 1;
  97 #else
  98 int ipsec_debug = 0;
  99 #endif
 100
 101 /* NB: name changed so netstat doesn't use it */
 102 struct newipsecstat newipsecstat;
 103 int ip4_ah_offsetmask = 0;      /* maybe IP_DF? */
 104 int ip4_ipsec_dfbit = 0;        /* DF bit on encap. 0: clear 1: set 2: copy */
 105 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
 106 int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
 107 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
 108 int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
 109 struct secpolicy ip4_def_policy;
 110 int ip4_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
 111 int ip4_esp_randpad = -1;
 112 /*
 113  * Crypto support requirements:
 114  *
 115  *  1   require hardware support
 116  * -1   require software support
 117  *  0   take anything
 118  */
 119 int     crypto_support = 0;
 120
 121 SYSCTL_DECL(_net_inet_ipsec);
 122
 123 /* net.inet.ipsec */
 124 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
 125         def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
 126 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
 127         CTLFLAG_RW, &ip4_esp_trans_deflev,      0, "");
 128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
 129         CTLFLAG_RW, &ip4_esp_net_deflev,        0, "");
 130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
 131         CTLFLAG_RW, &ip4_ah_trans_deflev,       0, "");
 132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
 133         CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
 134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
 135         ah_cleartos, CTLFLAG_RW,        &ah_cleartos,   0, "");
 136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
 137         ah_offsetmask, CTLFLAG_RW,      &ip4_ah_offsetmask,     0, "");
 138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
 139         dfbit, CTLFLAG_RW,      &ip4_ipsec_dfbit,       0, "");
 140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
 141         ecn, CTLFLAG_RW,        &ip4_ipsec_ecn, 0, "");
 142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
 143         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
 144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
 145         esp_randpad, CTLFLAG_RW,        &ip4_esp_randpad,       0, "");
 146 SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
 147         crypto_support, CTLFLAG_RW,     &crypto_support,0, "");
 148 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
 149         ipsecstats,     CTLFLAG_RD,     &newipsecstat,  newipsecstat, "");
 150
 151 #ifdef INET6
 152 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
 153 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
 154 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
 155 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
 156 int ip6_ipsec_ecn = 0;          /* ECN ignore(-1)/forbidden(0)/allowed(1) */
 157 int ip6_esp_randpad = -1;
 158
 159 SYSCTL_DECL(_net_inet6_ipsec6);
 160
 161 /* net.inet6.ipsec6 */
 162 #ifdef COMPAT_KAME
 163 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
 164         0,0, compat_ipsecstats_sysctl, "S", "");
 165 #endif /* COMPAT_KAME */
 166 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
 167         def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
 168 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
 169         CTLFLAG_RW, &ip6_esp_trans_deflev,      0, "");
 170 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
 171         CTLFLAG_RW, &ip6_esp_net_deflev,        0, "");
 172 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
 173         CTLFLAG_RW, &ip6_ah_trans_deflev,       0, "");
 174 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
 175         CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
 176 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
 177         ecn, CTLFLAG_RW,        &ip6_ipsec_ecn, 0, "");
 178 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
 179         debug, CTLFLAG_RW,      &ipsec_debug,   0, "");
 180 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
 181         esp_randpad, CTLFLAG_RW,        &ip6_esp_randpad,       0, "");
 182 #endif /* INET6 */
 183
 184 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
 185 #ifdef INET6
 186 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb));
 187 #endif
 188 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
 189 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
 190 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
 191 #ifdef INET6
 192 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
 193 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
 194 #endif
 195 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
 196 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
 197 static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
 198         int optname, caddr_t request, size_t len, int priv));
 199 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
 200 static void vshiftl __P((unsigned char *, int, int));
 201 static size_t ipsec_hdrsiz __P((struct secpolicy *));
 202
 203 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy");
 204
 205 /*
 206  * Return a held reference to the default SP.
 207  */
 208 static struct secpolicy *
 209 key_allocsp_default(const char* where, int tag)
 210 {
 211         struct secpolicy *sp;
 212
 213         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 214                 printf("DP key_allocsp_default from %s:%u\n", where, tag));
 215
 216         sp = &ip4_def_policy;
 217         if (sp->policy != IPSEC_POLICY_DISCARD &&
 218             sp->policy != IPSEC_POLICY_NONE) {
 219                 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
 220                     sp->policy, IPSEC_POLICY_NONE));
 221                 sp->policy = IPSEC_POLICY_NONE;
 222         }
 223         key_addref(sp);
 224
 225         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 226                 printf("DP key_allocsp_default returns SP:%p (%u)\n",
 227                         sp, sp->refcnt));
 228         return sp;
 229 }
 230 #define KEY_ALLOCSP_DEFAULT() \
 231         key_allocsp_default(__FILE__, __LINE__)
 232
 233 /*
 234  * For OUTBOUND packet having a socket. Searching SPD for packet,
 235  * and return a pointer to SP.
 236  * OUT: NULL:   no apropreate SP found, the following value is set to error.
 237  *              0       : bypass
 238  *              EACCES  : discard packet.
 239  *              ENOENT  : ipsec_acquire() in progress, maybe.
 240  *              others  : error occured.
 241  *      others: a pointer to SP
 242  *
 243  * NOTE: IPv6 mapped adddress concern is implemented here.
 244  */
 245 struct secpolicy *
 246 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
 247 {
 248         struct secpolicy *sp;
 249
 250         IPSEC_ASSERT(tdbi != NULL, ("null tdbi"));
 251         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
 252                 ("invalid direction %u", dir));
 253
 254         sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
 255         if (sp == NULL)                 /*XXX????*/
 256                 sp = KEY_ALLOCSP_DEFAULT();
 257         IPSEC_ASSERT(sp != NULL, ("null SP"));
 258         return sp;
 259 }
 260
 261 /*
 262  * For OUTBOUND packet having a socket. Searching SPD for packet,
 263  * and return a pointer to SP.
 264  * OUT: NULL:   no apropreate SP found, the following value is set to error.
 265  *              0       : bypass
 266  *              EACCES  : discard packet.
 267  *              ENOENT  : ipsec_acquire() in progress, maybe.
 268  *              others  : error occured.
 269  *      others: a pointer to SP
 270  *
 271  * NOTE: IPv6 mapped adddress concern is implemented here.
 272  */
 273 struct secpolicy *
 274 ipsec_getpolicybysock(m, dir, inp, error)
 275         struct mbuf *m;
 276         u_int dir;
 277         struct inpcb *inp;
 278         int *error;
 279 {
 280         struct inpcbpolicy *pcbsp = NULL;
 281         struct secpolicy *currsp = NULL;        /* policy on socket */
 282         struct secpolicy *sp;
 283
 284         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 285         IPSEC_ASSERT(inp != NULL, ("null inpcb"));
 286         IPSEC_ASSERT(error != NULL, ("null error"));
 287         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
 288                 ("invalid direction %u", dir));
 289
 290         /* set spidx in pcb */
 291         if (inp->inp_vflag & INP_IPV6PROTO) {
 292 #ifdef INET6
 293                 *error = ipsec6_setspidx_in6pcb(m, inp);
 294                 pcbsp = inp->in6p_sp;
 295 #else
 296                 *error = EINVAL;                /* should not happen */
 297 #endif
 298         } else {
 299                 *error = ipsec4_setspidx_inpcb(m, inp);
 300                 pcbsp = inp->inp_sp;
 301         }
 302         if (*error)
 303                 return NULL;
 304
 305         IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp"));
 306         switch (dir) {
 307         case IPSEC_DIR_INBOUND:
 308                 currsp = pcbsp->sp_in;
 309                 break;
 310         case IPSEC_DIR_OUTBOUND:
 311                 currsp = pcbsp->sp_out;
 312                 break;
 313         }
 314         IPSEC_ASSERT(currsp != NULL, ("null currsp"));
 315
 316         if (pcbsp->priv) {                      /* when privilieged socket */
 317                 switch (currsp->policy) {
 318                 case IPSEC_POLICY_BYPASS:
 319                 case IPSEC_POLICY_IPSEC:
 320                         key_addref(currsp);
 321                         sp = currsp;
 322                         break;
 323
 324                 case IPSEC_POLICY_ENTRUST:
 325                         /* look for a policy in SPD */
 326                         sp = KEY_ALLOCSP(&currsp->spidx, dir);
 327                         if (sp == NULL)         /* no SP found */
 328                                 sp = KEY_ALLOCSP_DEFAULT();
 329                         break;
 330
 331                 default:
 332                         ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n",
 333                                 __func__, currsp->policy));
 334                         *error = EINVAL;
 335                         return NULL;
 336                 }
 337         } else {                                /* unpriv, SPD has policy */
 338                 sp = KEY_ALLOCSP(&currsp->spidx, dir);
 339                 if (sp == NULL) {               /* no SP found */
 340                         switch (currsp->policy) {
 341                         case IPSEC_POLICY_BYPASS:
 342                                 ipseclog((LOG_ERR, "%s: Illegal policy for "
 343                                         "non-priviliged defined %d\n",
 344                                         __func__, currsp->policy));
 345                                 *error = EINVAL;
 346                                 return NULL;
 347
 348                         case IPSEC_POLICY_ENTRUST:
 349                                 sp = KEY_ALLOCSP_DEFAULT();
 350                                 break;
 351
 352                         case IPSEC_POLICY_IPSEC:
 353                                 key_addref(currsp);
 354                                 sp = currsp;
 355                                 break;
 356
 357                         default:
 358                                 ipseclog((LOG_ERR, "%s: Invalid policy for "
 359                                         "PCB %d\n", __func__, currsp->policy));
 360                                 *error = EINVAL;
 361                                 return NULL;
 362                         }
 363                 }
 364         }
 365         IPSEC_ASSERT(sp != NULL,
 366                 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy));
 367         KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
 368                 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n",
 369                         __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt));
 370         return sp;
 371 }
 372
 373 /*
 374  * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
 375  * and return a pointer to SP.
 376  * OUT: positive: a pointer to the entry for security policy leaf matched.
 377  *      NULL:   no apropreate SP found, the following value is set to error.
 378  *              0       : bypass
 379  *              EACCES  : discard packet.
 380  *              ENOENT  : ipsec_acquire() in progress, maybe.
 381  *              others  : error occured.
 382  */
 383 struct secpolicy *
 384 ipsec_getpolicybyaddr(m, dir, flag, error)
 385         struct mbuf *m;
 386         u_int dir;
 387         int flag;
 388         int *error;
 389 {
 390         struct secpolicyindex spidx;
 391         struct secpolicy *sp;
 392
 393         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 394         IPSEC_ASSERT(error != NULL, ("null error"));
 395         IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
 396                 ("invalid direction %u", dir));
 397
 398         sp = NULL;
 399         if (key_havesp(dir)) {
 400                 /* Make an index to look for a policy. */
 401                 *error = ipsec_setspidx(m, &spidx,
 402                                         (flag & IP_FORWARDING) ? 0 : 1);
 403                 if (*error != 0) {
 404                         DPRINTF(("%s: setpidx failed, dir %u flag %u\n",
 405                                 __func__, dir, flag));
 406                         return NULL;
 407                 }
 408                 spidx.dir = dir;
 409
 410                 sp = KEY_ALLOCSP(&spidx, dir);
 411         }
 412         if (sp == NULL)                 /* no SP found, use system default */
 413                 sp = KEY_ALLOCSP_DEFAULT();
 414         IPSEC_ASSERT(sp != NULL, ("null SP"));
 415         return sp;
 416 }
 417
 418 struct secpolicy *
 419 ipsec4_checkpolicy(m, dir, flag, error, inp)
 420         struct mbuf *m;
 421         u_int dir, flag;
 422         int *error;
 423         struct inpcb *inp;
 424 {
 425         struct secpolicy *sp;
 426
 427         *error = 0;
 428         if (inp == NULL)
 429                 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
 430         else
 431                 sp = ipsec_getpolicybysock(m, dir, inp, error);
 432         if (sp == NULL) {
 433                 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error"));
 434                 newipsecstat.ips_out_inval++;
 435                 return NULL;
 436         }
 437         IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error));
 438         switch (sp->policy) {
 439         case IPSEC_POLICY_ENTRUST:
 440         default:
 441                 printf("%s: invalid policy %u\n", __func__, sp->policy);
 442                 /* fall thru... */
 443         case IPSEC_POLICY_DISCARD:
 444                 newipsecstat.ips_out_polvio++;
 445                 *error = -EINVAL;       /* packet is discarded by caller */
 446                 break;
 447         case IPSEC_POLICY_BYPASS:
 448         case IPSEC_POLICY_NONE:
 449                 KEY_FREESP(&sp);
 450                 sp = NULL;              /* NB: force NULL result */
 451                 break;
 452         case IPSEC_POLICY_IPSEC:
 453                 if (sp->req == NULL)    /* acquire an SA */
 454                         *error = key_spdacquire(sp);
 455                 break;
 456         }
 457         if (*error != 0) {
 458                 KEY_FREESP(&sp);
 459                 sp = NULL;
 460         }
 461         return sp;
 462 }
 463
 464 static int
 465 ipsec4_setspidx_inpcb(m, pcb)
 466         struct mbuf *m;
 467         struct inpcb *pcb;
 468 {
 469         int error;
 470
 471         IPSEC_ASSERT(pcb != NULL, ("null pcb"));
 472         IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp"));
 473         IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
 474                 ("null sp_in || sp_out"));
 475
 476         error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
 477         if (error == 0) {
 478                 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
 479                 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
 480                 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
 481         } else {
 482                 bzero(&pcb->inp_sp->sp_in->spidx,
 483                         sizeof (pcb->inp_sp->sp_in->spidx));
 484                 bzero(&pcb->inp_sp->sp_out->spidx,
 485                         sizeof (pcb->inp_sp->sp_in->spidx));
 486         }
 487         return error;
 488 }
 489
 490 #ifdef INET6
 491 static int
 492 ipsec6_setspidx_in6pcb(m, pcb)
 493         struct mbuf *m;
 494         struct in6pcb *pcb;
 495 {
 496         struct secpolicyindex *spidx;
 497         int error;
 498
 499         IPSEC_ASSERT(pcb != NULL, ("null pcb"));
 500         IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp"));
 501         IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
 502                 ("null sp_in || sp_out"));
 503
 504         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
 505         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
 506
 507         spidx = &pcb->in6p_sp->sp_in->spidx;
 508         error = ipsec_setspidx(m, spidx, 1);
 509         if (error)
 510                 goto bad;
 511         spidx->dir = IPSEC_DIR_INBOUND;
 512
 513         spidx = &pcb->in6p_sp->sp_out->spidx;
 514         error = ipsec_setspidx(m, spidx, 1);
 515         if (error)
 516                 goto bad;
 517         spidx->dir = IPSEC_DIR_OUTBOUND;
 518
 519         return 0;
 520
 521 bad:
 522         bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
 523         bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
 524         return error;
 525 }
 526 #endif
 527
 528 /*
 529  * configure security policy index (src/dst/proto/sport/dport)
 530  * by looking at the content of mbuf.
 531  * the caller is responsible for error recovery (like clearing up spidx).
 532  */
 533 static int
 534 ipsec_setspidx(m, spidx, needport)
 535         struct mbuf *m;
 536         struct secpolicyindex *spidx;
 537         int needport;
 538 {
 539         struct ip *ip = NULL;
 540         struct ip ipbuf;
 541         u_int v;
 542         struct mbuf *n;
 543         int len;
 544         int error;
 545
 546         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 547
 548         /*
 549          * validate m->m_pkthdr.len.  we see incorrect length if we
 550          * mistakenly call this function with inconsistent mbuf chain
 551          * (like 4.4BSD tcp/udp processing).  XXX should we panic here?
 552          */
 553         len = 0;
 554         for (n = m; n; n = n->m_next)
 555                 len += n->m_len;
 556         if (m->m_pkthdr.len != len) {
 557                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 558                         printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n",
 559                                 __func__, len, m->m_pkthdr.len));
 560                 return EINVAL;
 561         }
 562
 563         if (m->m_pkthdr.len < sizeof(struct ip)) {
 564                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 565                         printf("%s: pkthdr len(%d) too small (v4), ignored.\n",
 566                             __func__, m->m_pkthdr.len));
 567                 return EINVAL;
 568         }
 569
 570         if (m->m_len >= sizeof(*ip))
 571                 ip = mtod(m, struct ip *);
 572         else {
 573                 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
 574                 ip = &ipbuf;
 575         }
 576 #ifdef _IP_VHL
 577         v = _IP_VHL_V(ip->ip_vhl);
 578 #else
 579         v = ip->ip_v;
 580 #endif
 581         switch (v) {
 582         case 4:
 583                 error = ipsec4_setspidx_ipaddr(m, spidx);
 584                 if (error)
 585                         return error;
 586                 ipsec4_get_ulp(m, spidx, needport);
 587                 return 0;
 588 #ifdef INET6
 589         case 6:
 590                 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
 591                         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 592                                 printf("%s: pkthdr len(%d) too small (v6), "
 593                                 "ignored\n", __func__, m->m_pkthdr.len));
 594                         return EINVAL;
 595                 }
 596                 error = ipsec6_setspidx_ipaddr(m, spidx);
 597                 if (error)
 598                         return error;
 599                 ipsec6_get_ulp(m, spidx, needport);
 600                 return 0;
 601 #endif
 602         default:
 603                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 604                         printf("%s: " "unknown IP version %u, ignored.\n",
 605                                 __func__, v));
 606                 return EINVAL;
 607         }
 608 }
 609
 610 static void
 611 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
 612 {
 613         u_int8_t nxt;
 614         int off;
 615
 616         /* sanity check */
 617         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 618         IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short"));
 619
 620         /* NB: ip_input() flips it into host endian XXX need more checking */
 621         if (m->m_len < sizeof (struct ip)) {
 622                 struct ip *ip = mtod(m, struct ip *);
 623                 if (ip->ip_off & (IP_MF | IP_OFFMASK))
 624                         goto done;
 625 #ifdef _IP_VHL
 626                 off = _IP_VHL_HL(ip->ip_vhl) << 2;
 627 #else
 628                 off = ip->ip_hl << 2;
 629 #endif
 630                 nxt = ip->ip_p;
 631         } else {
 632                 struct ip ih;
 633
 634                 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
 635                 if (ih.ip_off & (IP_MF | IP_OFFMASK))
 636                         goto done;
 637 #ifdef _IP_VHL
 638                 off = _IP_VHL_HL(ih.ip_vhl) << 2;
 639 #else
 640                 off = ih.ip_hl << 2;
 641 #endif
 642                 nxt = ih.ip_p;
 643         }
 644
 645         while (off < m->m_pkthdr.len) {
 646                 struct ip6_ext ip6e;
 647                 struct tcphdr th;
 648                 struct udphdr uh;
 649
 650                 switch (nxt) {
 651                 case IPPROTO_TCP:
 652                         spidx->ul_proto = nxt;
 653                         if (!needport)
 654                                 goto done_proto;
 655                         if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
 656                                 goto done;
 657                         m_copydata(m, off, sizeof (th), (caddr_t) &th);
 658                         spidx->src.sin.sin_port = th.th_sport;
 659                         spidx->dst.sin.sin_port = th.th_dport;
 660                         return;
 661                 case IPPROTO_UDP:
 662                         spidx->ul_proto = nxt;
 663                         if (!needport)
 664                                 goto done_proto;
 665                         if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
 666                                 goto done;
 667                         m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
 668                         spidx->src.sin.sin_port = uh.uh_sport;
 669                         spidx->dst.sin.sin_port = uh.uh_dport;
 670                         return;
 671                 case IPPROTO_AH:
 672                         if (off + sizeof(ip6e) > m->m_pkthdr.len)
 673                                 goto done;
 674                         /* XXX sigh, this works but is totally bogus */
 675                         m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
 676                         off += (ip6e.ip6e_len + 2) << 2;
 677                         nxt = ip6e.ip6e_nxt;
 678                         break;
 679                 case IPPROTO_ICMP:
 680                 default:
 681                         /* XXX intermediate headers??? */
 682                         spidx->ul_proto = nxt;
 683                         goto done_proto;
 684                 }
 685         }
 686 done:
 687         spidx->ul_proto = IPSEC_ULPROTO_ANY;
 688 done_proto:
 689         spidx->src.sin.sin_port = IPSEC_PORT_ANY;
 690         spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
 691 }
 692
 693 /* assumes that m is sane */
 694 static int
 695 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
 696 {
 697         static const struct sockaddr_in template = {
 698                 sizeof (struct sockaddr_in),
 699                 AF_INET,
 700                 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
 701         };
 702
 703         spidx->src.sin = template;
 704         spidx->dst.sin = template;
 705
 706         if (m->m_len < sizeof (struct ip)) {
 707                 m_copydata(m, offsetof(struct ip, ip_src),
 708                            sizeof (struct  in_addr),
 709                            (caddr_t) &spidx->src.sin.sin_addr);
 710                 m_copydata(m, offsetof(struct ip, ip_dst),
 711                            sizeof (struct  in_addr),
 712                            (caddr_t) &spidx->dst.sin.sin_addr);
 713         } else {
 714                 struct ip *ip = mtod(m, struct ip *);
 715                 spidx->src.sin.sin_addr = ip->ip_src;
 716                 spidx->dst.sin.sin_addr = ip->ip_dst;
 717         }
 718
 719         spidx->prefs = sizeof(struct in_addr) << 3;
 720         spidx->prefd = sizeof(struct in_addr) << 3;
 721
 722         return 0;
 723 }
 724
 725 #ifdef INET6
 726 static void
 727 ipsec6_get_ulp(m, spidx, needport)
 728         struct mbuf *m;
 729         struct secpolicyindex *spidx;
 730         int needport;
 731 {
 732         int off, nxt;
 733         struct tcphdr th;
 734         struct udphdr uh;
 735
 736         /* sanity check */
 737         if (m == NULL)
 738                 panic("%s: NULL pointer was passed.\n", __func__);
 739
 740         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 741                 printf("%s:\n", __func__); kdebug_mbuf(m));
 742
 743         /* set default */
 744         spidx->ul_proto = IPSEC_ULPROTO_ANY;
 745         ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
 746         ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
 747
 748         nxt = -1;
 749         off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
 750         if (off < 0 || m->m_pkthdr.len < off)
 751                 return;
 752
 753         switch (nxt) {
 754         case IPPROTO_TCP:
 755                 spidx->ul_proto = nxt;
 756                 if (!needport)
 757                         break;
 758                 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
 759                         break;
 760                 m_copydata(m, off, sizeof(th), (caddr_t)&th);
 761                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
 762                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
 763                 break;
 764         case IPPROTO_UDP:
 765                 spidx->ul_proto = nxt;
 766                 if (!needport)
 767                         break;
 768                 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
 769                         break;
 770                 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
 771                 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
 772                 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
 773                 break;
 774         case IPPROTO_ICMPV6:
 775         default:
 776                 /* XXX intermediate headers??? */
 777                 spidx->ul_proto = nxt;
 778                 break;
 779         }
 780 }
 781
 782 /* assumes that m is sane */
 783 static int
 784 ipsec6_setspidx_ipaddr(m, spidx)
 785         struct mbuf *m;
 786         struct secpolicyindex *spidx;
 787 {
 788         struct ip6_hdr *ip6 = NULL;
 789         struct ip6_hdr ip6buf;
 790         struct sockaddr_in6 *sin6;
 791
 792         if (m->m_len >= sizeof(*ip6))
 793                 ip6 = mtod(m, struct ip6_hdr *);
 794         else {
 795                 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
 796                 ip6 = &ip6buf;
 797         }
 798
 799         sin6 = (struct sockaddr_in6 *)&spidx->src;
 800         bzero(sin6, sizeof(*sin6));
 801         sin6->sin6_family = AF_INET6;
 802         sin6->sin6_len = sizeof(struct sockaddr_in6);
 803         bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
 804         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
 805                 sin6->sin6_addr.s6_addr16[1] = 0;
 806                 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
 807         }
 808         spidx->prefs = sizeof(struct in6_addr) << 3;
 809
 810         sin6 = (struct sockaddr_in6 *)&spidx->dst;
 811         bzero(sin6, sizeof(*sin6));
 812         sin6->sin6_family = AF_INET6;
 813         sin6->sin6_len = sizeof(struct sockaddr_in6);
 814         bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
 815         if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
 816                 sin6->sin6_addr.s6_addr16[1] = 0;
 817                 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
 818         }
 819         spidx->prefd = sizeof(struct in6_addr) << 3;
 820
 821         return 0;
 822 }
 823 #endif
 824
 825 static void
 826 ipsec_delpcbpolicy(p)
 827         struct inpcbpolicy *p;
 828 {
 829         free(p, M_IPSEC_INPCB);
 830 }
 831
 832 /* initialize policy in PCB */
 833 int
 834 ipsec_init_policy(so, pcb_sp)
 835         struct socket *so;
 836         struct inpcbpolicy **pcb_sp;
 837 {
 838         struct inpcbpolicy *new;
 839
 840         /* sanity check. */
 841         if (so == NULL || pcb_sp == NULL)
 842                 panic("%s: NULL pointer was passed.\n", __func__);
 843
 844         new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
 845                                             M_IPSEC_INPCB, M_NOWAIT|M_ZERO);
 846         if (new == NULL) {
 847                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
 848                 return ENOBUFS;
 849         }
 850
 851         new->priv = IPSEC_IS_PRIVILEGED_SO(so);
 852
 853         if ((new->sp_in = KEY_NEWSP()) == NULL) {
 854                 ipsec_delpcbpolicy(new);
 855                 return ENOBUFS;
 856         }
 857         new->sp_in->state = IPSEC_SPSTATE_ALIVE;
 858         new->sp_in->policy = IPSEC_POLICY_ENTRUST;
 859
 860         if ((new->sp_out = KEY_NEWSP()) == NULL) {
 861                 KEY_FREESP(&new->sp_in);
 862                 ipsec_delpcbpolicy(new);
 863                 return ENOBUFS;
 864         }
 865         new->sp_out->state = IPSEC_SPSTATE_ALIVE;
 866         new->sp_out->policy = IPSEC_POLICY_ENTRUST;
 867
 868         *pcb_sp = new;
 869
 870         return 0;
 871 }
 872
 873 /* copy old ipsec policy into new */
 874 int
 875 ipsec_copy_policy(old, new)
 876         struct inpcbpolicy *old, *new;
 877 {
 878         struct secpolicy *sp;
 879
 880         sp = ipsec_deepcopy_policy(old->sp_in);
 881         if (sp) {
 882                 KEY_FREESP(&new->sp_in);
 883                 new->sp_in = sp;
 884         } else
 885                 return ENOBUFS;
 886
 887         sp = ipsec_deepcopy_policy(old->sp_out);
 888         if (sp) {
 889                 KEY_FREESP(&new->sp_out);
 890                 new->sp_out = sp;
 891         } else
 892                 return ENOBUFS;
 893
 894         new->priv = old->priv;
 895
 896         return 0;
 897 }
 898
 899 struct ipsecrequest *
 900 ipsec_newisr(void)
 901 {
 902         struct ipsecrequest *p;
 903
 904         p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO);
 905         if (p != NULL)
 906                 IPSECREQUEST_LOCK_INIT(p);
 907         return p;
 908 }
 909
 910 void
 911 ipsec_delisr(struct ipsecrequest *p)
 912 {
 913         IPSECREQUEST_LOCK_DESTROY(p);
 914         free(p, M_IPSEC_SR);
 915 }
 916
 917 /* deep-copy a policy in PCB */
 918 static struct secpolicy *
 919 ipsec_deepcopy_policy(src)
 920         struct secpolicy *src;
 921 {
 922         struct ipsecrequest *newchain = NULL;
 923         struct ipsecrequest *p;
 924         struct ipsecrequest **q;
 925         struct ipsecrequest *r;
 926         struct secpolicy *dst;
 927
 928         if (src == NULL)
 929                 return NULL;
 930         dst = KEY_NEWSP();
 931         if (dst == NULL)
 932                 return NULL;
 933
 934         /*
 935          * deep-copy IPsec request chain.  This is required since struct
 936          * ipsecrequest is not reference counted.
 937          */
 938         q = &newchain;
 939         for (p = src->req; p; p = p->next) {
 940                 *q = ipsec_newisr();
 941                 if (*q == NULL)
 942                         goto fail;
 943                 (*q)->saidx.proto = p->saidx.proto;
 944                 (*q)->saidx.mode = p->saidx.mode;
 945                 (*q)->level = p->level;
 946                 (*q)->saidx.reqid = p->saidx.reqid;
 947
 948                 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
 949                 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
 950
 951                 (*q)->sp = dst;
 952
 953                 q = &((*q)->next);
 954         }
 955
 956         dst->req = newchain;
 957         dst->state = src->state;
 958         dst->policy = src->policy;
 959         /* do not touch the refcnt fields */
 960
 961         return dst;
 962
 963 fail:
 964         for (p = newchain; p; p = r) {
 965                 r = p->next;
 966                 ipsec_delisr(p);
 967                 p = NULL;
 968         }
 969         return NULL;
 970 }
 971
 972 /* set policy and ipsec request if present. */
 973 static int
 974 ipsec_set_policy(pcb_sp, optname, request, len, priv)
 975         struct secpolicy **pcb_sp;
 976         int optname;
 977         caddr_t request;
 978         size_t len;
 979         int priv;
 980 {
 981         struct sadb_x_policy *xpl;
 982         struct secpolicy *newsp = NULL;
 983         int error;
 984
 985         /* sanity check. */
 986         if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
 987                 return EINVAL;
 988         if (len < sizeof(*xpl))
 989                 return EINVAL;
 990         xpl = (struct sadb_x_policy *)request;
 991
 992         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
 993                 printf("%s: passed policy\n", __func__);
 994                 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
 995
 996         /* check policy type */
 997         /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
 998         if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
 999          || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
1000                 return EINVAL;
1001
1002         /* check privileged socket */
1003         if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
1004                 return EACCES;
1005
1006         /* allocation new SP entry */
1007         if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
1008                 return error;
1009
1010         newsp->state = IPSEC_SPSTATE_ALIVE;
1011
1012         /* clear old SP and set new SP */
1013         KEY_FREESP(pcb_sp);
1014         *pcb_sp = newsp;
1015         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1016                 printf("%s: new policy\n", __func__);
1017                 kdebug_secpolicy(newsp));
1018
1019         return 0;
1020 }
1021
1022 static int
1023 ipsec_get_policy(pcb_sp, mp)
1024         struct secpolicy *pcb_sp;
1025         struct mbuf **mp;
1026 {
1027
1028         /* sanity check. */
1029         if (pcb_sp == NULL || mp == NULL)
1030                 return EINVAL;
1031
1032         *mp = key_sp2msg(pcb_sp);
1033         if (!*mp) {
1034                 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
1035                 return ENOBUFS;
1036         }
1037
1038         (*mp)->m_type = MT_DATA;
1039         KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1040                 printf("%s:\n", __func__); kdebug_mbuf(*mp));
1041
1042         return 0;
1043 }
1044
1045 int
1046 ipsec4_set_policy(inp, optname, request, len, priv)
1047         struct inpcb *inp;
1048         int optname;
1049         caddr_t request;
1050         size_t len;
1051         int priv;
1052 {
1053         struct sadb_x_policy *xpl;
1054         struct secpolicy **pcb_sp;
1055
1056         /* sanity check. */
1057         if (inp == NULL || request == NULL)
1058                 return EINVAL;
1059         if (len < sizeof(*xpl))
1060                 return EINVAL;
1061         xpl = (struct sadb_x_policy *)request;
1062
1063         /* select direction */
1064         switch (xpl->sadb_x_policy_dir) {
1065         case IPSEC_DIR_INBOUND:
1066                 pcb_sp = &inp->inp_sp->sp_in;
1067                 break;
1068         case IPSEC_DIR_OUTBOUND:
1069                 pcb_sp = &inp->inp_sp->sp_out;
1070                 break;
1071         default:
1072                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1073                         xpl->sadb_x_policy_dir));
1074                 return EINVAL;
1075         }
1076
1077         return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1078 }
1079
1080 int
1081 ipsec4_get_policy(inp, request, len, mp)
1082         struct inpcb *inp;
1083         caddr_t request;
1084         size_t len;
1085         struct mbuf **mp;
1086 {
1087         struct sadb_x_policy *xpl;
1088         struct secpolicy *pcb_sp;
1089
1090         /* sanity check. */
1091         if (inp == NULL || request == NULL || mp == NULL)
1092                 return EINVAL;
1093         IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp"));
1094         if (len < sizeof(*xpl))
1095                 return EINVAL;
1096         xpl = (struct sadb_x_policy *)request;
1097
1098         /* select direction */
1099         switch (xpl->sadb_x_policy_dir) {
1100         case IPSEC_DIR_INBOUND:
1101                 pcb_sp = inp->inp_sp->sp_in;
1102                 break;
1103         case IPSEC_DIR_OUTBOUND:
1104                 pcb_sp = inp->inp_sp->sp_out;
1105                 break;
1106         default:
1107                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1108                         xpl->sadb_x_policy_dir));
1109                 return EINVAL;
1110         }
1111
1112         return ipsec_get_policy(pcb_sp, mp);
1113 }
1114
1115 /* delete policy in PCB */
1116 int
1117 ipsec4_delete_pcbpolicy(inp)
1118         struct inpcb *inp;
1119 {
1120         IPSEC_ASSERT(inp != NULL, ("null inp"));
1121
1122         if (inp->inp_sp == NULL)
1123                 return 0;
1124
1125         if (inp->inp_sp->sp_in != NULL)
1126                 KEY_FREESP(&inp->inp_sp->sp_in);
1127
1128         if (inp->inp_sp->sp_out != NULL)
1129                 KEY_FREESP(&inp->inp_sp->sp_out);
1130
1131         ipsec_delpcbpolicy(inp->inp_sp);
1132         inp->inp_sp = NULL;
1133
1134         return 0;
1135 }
1136
1137 #ifdef INET6
1138 int
1139 ipsec6_set_policy(in6p, optname, request, len, priv)
1140         struct in6pcb *in6p;
1141         int optname;
1142         caddr_t request;
1143         size_t len;
1144         int priv;
1145 {
1146         struct sadb_x_policy *xpl;
1147         struct secpolicy **pcb_sp;
1148
1149         /* sanity check. */
1150         if (in6p == NULL || request == NULL)
1151                 return EINVAL;
1152         if (len < sizeof(*xpl))
1153                 return EINVAL;
1154         xpl = (struct sadb_x_policy *)request;
1155
1156         /* select direction */
1157         switch (xpl->sadb_x_policy_dir) {
1158         case IPSEC_DIR_INBOUND:
1159                 pcb_sp = &in6p->in6p_sp->sp_in;
1160                 break;
1161         case IPSEC_DIR_OUTBOUND:
1162                 pcb_sp = &in6p->in6p_sp->sp_out;
1163                 break;
1164         default:
1165                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1166                         xpl->sadb_x_policy_dir));
1167                 return EINVAL;
1168         }
1169
1170         return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1171 }
1172
1173 int
1174 ipsec6_get_policy(in6p, request, len, mp)
1175         struct in6pcb *in6p;
1176         caddr_t request;
1177         size_t len;
1178         struct mbuf **mp;
1179 {
1180         struct sadb_x_policy *xpl;
1181         struct secpolicy *pcb_sp;
1182
1183         /* sanity check. */
1184         if (in6p == NULL || request == NULL || mp == NULL)
1185                 return EINVAL;
1186         IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp"));
1187         if (len < sizeof(*xpl))
1188                 return EINVAL;
1189         xpl = (struct sadb_x_policy *)request;
1190
1191         /* select direction */
1192         switch (xpl->sadb_x_policy_dir) {
1193         case IPSEC_DIR_INBOUND:
1194                 pcb_sp = in6p->in6p_sp->sp_in;
1195                 break;
1196         case IPSEC_DIR_OUTBOUND:
1197                 pcb_sp = in6p->in6p_sp->sp_out;
1198                 break;
1199         default:
1200                 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1201                         xpl->sadb_x_policy_dir));
1202                 return EINVAL;
1203         }
1204
1205         return ipsec_get_policy(pcb_sp, mp);
1206 }
1207
1208 int
1209 ipsec6_delete_pcbpolicy(in6p)
1210         struct in6pcb *in6p;
1211 {
1212         IPSEC_ASSERT(in6p != NULL, ("null in6p"));
1213
1214         if (in6p->in6p_sp == NULL)
1215                 return 0;
1216
1217         if (in6p->in6p_sp->sp_in != NULL)
1218                 KEY_FREESP(&in6p->in6p_sp->sp_in);
1219
1220         if (in6p->in6p_sp->sp_out != NULL)
1221                 KEY_FREESP(&in6p->in6p_sp->sp_out);
1222
1223         ipsec_delpcbpolicy(in6p->in6p_sp);
1224         in6p->in6p_sp = NULL;
1225
1226         return 0;
1227 }
1228 #endif
1229
1230 /*
1231  * return current level.
1232  * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1233  */
1234 u_int
1235 ipsec_get_reqlevel(isr)
1236         struct ipsecrequest *isr;
1237 {
1238         u_int level = 0;
1239         u_int esp_trans_deflev, esp_net_deflev;
1240         u_int ah_trans_deflev, ah_net_deflev;
1241
1242         IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument"));
1243         IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1244                 ("af family mismatch, src %u, dst %u",
1245                  isr->sp->spidx.src.sa.sa_family,
1246                  isr->sp->spidx.dst.sa.sa_family));
1247
1248 /* XXX note that we have ipseclog() expanded here - code sync issue */
1249 #define IPSEC_CHECK_DEFAULT(lev) \
1250         (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE            \
1251                         && (lev) != IPSEC_LEVEL_UNIQUE)                       \
1252                 ? (ipsec_debug                                                \
1253                         ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1254                                 (lev), IPSEC_LEVEL_REQUIRE)                   \
1255                         : 0),                                                 \
1256                         (lev) = IPSEC_LEVEL_REQUIRE,                          \
1257                         (lev)                                                 \
1258                 : (lev))
1259
1260         /* set default level */
1261         switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1262 #ifdef INET
1263         case AF_INET:
1264                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1265                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1266                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1267                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1268                 break;
1269 #endif
1270 #ifdef INET6
1271         case AF_INET6:
1272                 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1273                 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1274                 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1275                 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1276                 break;
1277 #endif /* INET6 */
1278         default:
1279                 panic("%s: unknown af %u",
1280                         __func__, isr->sp->spidx.src.sa.sa_family);
1281         }
1282
1283 #undef IPSEC_CHECK_DEFAULT
1284
1285         /* set level */
1286         switch (isr->level) {
1287         case IPSEC_LEVEL_DEFAULT:
1288                 switch (isr->saidx.proto) {
1289                 case IPPROTO_ESP:
1290                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1291                                 level = esp_net_deflev;
1292                         else
1293                                 level = esp_trans_deflev;
1294                         break;
1295                 case IPPROTO_AH:
1296                         if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1297                                 level = ah_net_deflev;
1298                         else
1299                                 level = ah_trans_deflev;
1300                         break;
1301                 case IPPROTO_IPCOMP:
1302                         /*
1303                          * we don't really care, as IPcomp document says that
1304                          * we shouldn't compress small packets
1305                          */
1306                         level = IPSEC_LEVEL_USE;
1307                         break;
1308                 default:
1309                         panic("%s: Illegal protocol defined %u\n", __func__,
1310                                 isr->saidx.proto);
1311                 }
1312                 break;
1313
1314         case IPSEC_LEVEL_USE:
1315         case IPSEC_LEVEL_REQUIRE:
1316                 level = isr->level;
1317                 break;
1318         case IPSEC_LEVEL_UNIQUE:
1319                 level = IPSEC_LEVEL_REQUIRE;
1320                 break;
1321
1322         default:
1323                 panic("%s: Illegal IPsec level %u\n", __func__, isr->level);
1324         }
1325
1326         return level;
1327 }
1328
1329 /*
1330  * Check security policy requirements against the actual
1331  * packet contents.  Return one if the packet should be
1332  * reject as "invalid"; otherwiser return zero to have the
1333  * packet treated as "valid".
1334  *
1335  * OUT:
1336  *      0: valid
1337  *      1: invalid
1338  */
1339 int
1340 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1341 {
1342         struct ipsecrequest *isr;
1343         int need_auth;
1344
1345         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1346                 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1347
1348         /* check policy */
1349         switch (sp->policy) {
1350         case IPSEC_POLICY_DISCARD:
1351                 return 1;
1352         case IPSEC_POLICY_BYPASS:
1353         case IPSEC_POLICY_NONE:
1354                 return 0;
1355         }
1356
1357         IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1358                 ("invalid policy %u", sp->policy));
1359
1360         /* XXX should compare policy against ipsec header history */
1361
1362         need_auth = 0;
1363         for (isr = sp->req; isr != NULL; isr = isr->next) {
1364                 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1365                         continue;
1366                 switch (isr->saidx.proto) {
1367                 case IPPROTO_ESP:
1368                         if ((m->m_flags & M_DECRYPTED) == 0) {
1369                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1370                                     printf("%s: ESP m_flags:%x\n", __func__,
1371                                             m->m_flags));
1372                                 return 1;
1373                         }
1374
1375                         if (!need_auth &&
1376                             isr->sav != NULL &&
1377                             isr->sav->tdb_authalgxform != NULL &&
1378                             (m->m_flags & M_AUTHIPDGM) == 0) {
1379                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1380                                     printf("%s: ESP/AH m_flags:%x\n", __func__,
1381                                             m->m_flags));
1382                                 return 1;
1383                         }
1384                         break;
1385                 case IPPROTO_AH:
1386                         need_auth = 1;
1387                         if ((m->m_flags & M_AUTHIPHDR) == 0) {
1388                                 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1389                                     printf("%s: AH m_flags:%x\n", __func__,
1390                                             m->m_flags));
1391                                 return 1;
1392                         }
1393                         break;
1394                 case IPPROTO_IPCOMP:
1395                         /*
1396                          * we don't really care, as IPcomp document
1397                          * says that we shouldn't compress small
1398                          * packets, IPComp policy should always be
1399                          * treated as being in "use" level.
1400                          */
1401                         break;
1402                 }
1403         }
1404         return 0;               /* valid */
1405 }
1406
1407 /*
1408  * Check AH/ESP integrity.
1409  * This function is called from tcp_input(), udp_input(),
1410  * and {ah,esp}4_input for tunnel mode
1411  */
1412 int
1413 ipsec4_in_reject(m, inp)
1414         struct mbuf *m;
1415         struct inpcb *inp;
1416 {
1417         struct secpolicy *sp;
1418         int error;
1419         int result;
1420
1421         IPSEC_ASSERT(m != NULL, ("null mbuf"));
1422
1423         /* get SP for this packet.
1424          * When we are called from ip_forward(), we call
1425          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1426          */
1427         if (inp == NULL)
1428                 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1429         else
1430                 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1431
1432         if (sp != NULL) {
1433                 result = ipsec_in_reject(sp, m);
1434                 if (result)
1435                         newipsecstat.ips_in_polvio++;
1436                 KEY_FREESP(&sp);
1437         } else {
1438                 result = 0;     /* XXX should be panic ?
1439                                  * -> No, there may be error. */
1440         }
1441         return result;
1442 }
1443
1444 #ifdef INET6
1445 /*
1446  * Check AH/ESP integrity.
1447  * This function is called from tcp6_input(), udp6_input(),
1448  * and {ah,esp}6_input for tunnel mode
1449  */
1450 int
1451 ipsec6_in_reject(m, inp)
1452         struct mbuf *m;
1453         struct inpcb *inp;
1454 {
1455         struct secpolicy *sp = NULL;
1456         int error;
1457         int result;
1458
1459         /* sanity check */
1460         if (m == NULL)
1461                 return 0;       /* XXX should be panic ? */
1462
1463         /* get SP for this packet.
1464          * When we are called from ip_forward(), we call
1465          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1466          */
1467         if (inp == NULL)
1468                 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1469         else
1470                 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1471
1472         if (sp != NULL) {
1473                 result = ipsec_in_reject(sp, m);
1474                 if (result)
1475                         newipsecstat.ips_in_polvio++;
1476                 KEY_FREESP(&sp);
1477         } else {
1478                 result = 0;
1479         }
1480         return result;
1481 }
1482 #endif
1483
1484 /*
1485  * compute the byte size to be occupied by IPsec header.
1486  * in case it is tunneled, it includes the size of outer IP header.
1487  * NOTE: SP passed is free in this function.
1488  */
1489 static size_t
1490 ipsec_hdrsiz(struct secpolicy *sp)
1491 {
1492         struct ipsecrequest *isr;
1493         size_t siz;
1494
1495         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1496                 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1497
1498         switch (sp->policy) {
1499         case IPSEC_POLICY_DISCARD:
1500         case IPSEC_POLICY_BYPASS:
1501         case IPSEC_POLICY_NONE:
1502                 return 0;
1503         }
1504
1505         IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1506                 ("invalid policy %u", sp->policy));
1507
1508         siz = 0;
1509         for (isr = sp->req; isr != NULL; isr = isr->next) {
1510                 size_t clen = 0;
1511
1512                 switch (isr->saidx.proto) {
1513                 case IPPROTO_ESP:
1514                         clen = esp_hdrsiz(isr->sav);
1515                         break;
1516                 case IPPROTO_AH:
1517                         clen = ah_hdrsiz(isr->sav);
1518                         break;
1519                 case IPPROTO_IPCOMP:
1520                         clen = sizeof(struct ipcomp);
1521                         break;
1522                 }
1523
1524                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1525                         switch (isr->saidx.dst.sa.sa_family) {
1526                         case AF_INET:
1527                                 clen += sizeof(struct ip);
1528                                 break;
1529 #ifdef INET6
1530                         case AF_INET6:
1531                                 clen += sizeof(struct ip6_hdr);
1532                                 break;
1533 #endif
1534                         default:
1535                                 ipseclog((LOG_ERR, "%s: unknown AF %d in "
1536                                     "IPsec tunnel SA\n", __func__,
1537                                     ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1538                                 break;
1539                         }
1540                 }
1541                 siz += clen;
1542         }
1543
1544         return siz;
1545 }
1546
1547 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1548 size_t
1549 ipsec4_hdrsiz(m, dir, inp)
1550         struct mbuf *m;
1551         u_int dir;
1552         struct inpcb *inp;
1553 {
1554         struct secpolicy *sp;
1555         int error;
1556         size_t size;
1557
1558         IPSEC_ASSERT(m != NULL, ("null mbuf"));
1559
1560         /* get SP for this packet.
1561          * When we are called from ip_forward(), we call
1562          * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1563          */
1564         if (inp == NULL)
1565                 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1566         else
1567                 sp = ipsec_getpolicybysock(m, dir, inp, &error);
1568
1569         if (sp != NULL) {
1570                 size = ipsec_hdrsiz(sp);
1571                 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1572                         printf("%s: size:%lu.\n", __func__,
1573                                 (unsigned long)size));
1574
1575                 KEY_FREESP(&sp);
1576         } else {
1577                 size = 0;       /* XXX should be panic ? */
1578         }
1579         return size;
1580 }
1581
1582 #ifdef INET6
1583 /* This function is called from ipsec6_hdrsize_tcp(),
1584  * and maybe from ip6_forward.()
1585  */
1586 size_t
1587 ipsec6_hdrsiz(m, dir, in6p)
1588         struct mbuf *m;
1589         u_int dir;
1590         struct in6pcb *in6p;
1591 {
1592         struct secpolicy *sp;
1593         int error;
1594         size_t size;
1595
1596         IPSEC_ASSERT(m != NULL, ("null mbuf"));
1597         IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL,
1598                 ("socket w/o inpcb"));
1599
1600         /* get SP for this packet */
1601         /* XXX Is it right to call with IP_FORWARDING. */
1602         if (in6p == NULL)
1603                 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1604         else
1605                 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
1606
1607         if (sp == NULL)
1608                 return 0;
1609         size = ipsec_hdrsiz(sp);
1610         KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1611                 printf("%s: size:%lu.\n", __func__, (unsigned long)size));
1612         KEY_FREESP(&sp);
1613
1614         return size;
1615 }
1616 #endif /*INET6*/
1617
1618 /*
1619  * Check the variable replay window.
1620  * ipsec_chkreplay() performs replay check before ICV verification.
1621  * ipsec_updatereplay() updates replay bitmap.  This must be called after
1622  * ICV verification (it also performs replay check, which is usually done
1623  * beforehand).
1624  * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1625  *
1626  * based on RFC 2401.
1627  */
1628 int
1629 ipsec_chkreplay(seq, sav)
1630         u_int32_t seq;
1631         struct secasvar *sav;
1632 {
1633         const struct secreplay *replay;
1634         u_int32_t diff;
1635         int fr;
1636         u_int32_t wsizeb;       /* constant: bits of window size */
1637         int frlast;             /* constant: last frame */
1638
1639         IPSEC_SPLASSERT_SOFTNET(__func__);
1640
1641         IPSEC_ASSERT(sav != NULL, ("Null SA"));
1642         IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1643
1644         replay = sav->replay;
1645
1646         if (replay->wsize == 0)
1647                 return 1;       /* no need to check replay. */
1648
1649         /* constant */
1650         frlast = replay->wsize - 1;
1651         wsizeb = replay->wsize << 3;
1652
1653         /* sequence number of 0 is invalid */
1654         if (seq == 0)
1655                 return 0;
1656
1657         /* first time is always okay */
1658         if (replay->count == 0)
1659                 return 1;
1660
1661         if (seq > replay->lastseq) {
1662                 /* larger sequences are okay */
1663                 return 1;
1664         } else {
1665                 /* seq is equal or less than lastseq. */
1666                 diff = replay->lastseq - seq;
1667
1668                 /* over range to check, i.e. too old or wrapped */
1669                 if (diff >= wsizeb)
1670                         return 0;
1671
1672                 fr = frlast - diff / 8;
1673
1674                 /* this packet already seen ? */
1675                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1676                         return 0;
1677
1678                 /* out of order but good */
1679                 return 1;
1680         }
1681 }
1682
1683 /*
1684  * check replay counter whether to update or not.
1685  * OUT: 0:      OK
1686  *      1:      NG
1687  */
1688 int
1689 ipsec_updatereplay(seq, sav)
1690         u_int32_t seq;
1691         struct secasvar *sav;
1692 {
1693         struct secreplay *replay;
1694         u_int32_t diff;
1695         int fr;
1696         u_int32_t wsizeb;       /* constant: bits of window size */
1697         int frlast;             /* constant: last frame */
1698
1699         IPSEC_SPLASSERT_SOFTNET(__func__);
1700
1701         IPSEC_ASSERT(sav != NULL, ("Null SA"));
1702         IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1703
1704         replay = sav->replay;
1705
1706         if (replay->wsize == 0)
1707                 goto ok;        /* no need to check replay. */
1708
1709         /* constant */
1710         frlast = replay->wsize - 1;
1711         wsizeb = replay->wsize << 3;
1712
1713         /* sequence number of 0 is invalid */
1714         if (seq == 0)
1715                 return 1;
1716
1717         /* first time */
1718         if (replay->count == 0) {
1719                 replay->lastseq = seq;
1720                 bzero(replay->bitmap, replay->wsize);
1721                 (replay->bitmap)[frlast] = 1;
1722                 goto ok;
1723         }
1724
1725         if (seq > replay->lastseq) {
1726                 /* seq is larger than lastseq. */
1727                 diff = seq - replay->lastseq;
1728
1729                 /* new larger sequence number */
1730                 if (diff < wsizeb) {
1731                         /* In window */
1732                         /* set bit for this packet */
1733                         vshiftl(replay->bitmap, diff, replay->wsize);
1734                         (replay->bitmap)[frlast] |= 1;
1735                 } else {
1736                         /* this packet has a "way larger" */
1737                         bzero(replay->bitmap, replay->wsize);
1738                         (replay->bitmap)[frlast] = 1;
1739                 }
1740                 replay->lastseq = seq;
1741
1742                 /* larger is good */
1743         } else {
1744                 /* seq is equal or less than lastseq. */
1745                 diff = replay->lastseq - seq;
1746
1747                 /* over range to check, i.e. too old or wrapped */
1748                 if (diff >= wsizeb)
1749                         return 1;
1750
1751                 fr = frlast - diff / 8;
1752
1753                 /* this packet already seen ? */
1754                 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1755                         return 1;
1756
1757                 /* mark as seen */
1758                 (replay->bitmap)[fr] |= (1 << (diff % 8));
1759
1760                 /* out of order but good */
1761         }
1762
1763 ok:
1764         if (replay->count == ~0) {
1765
1766                 /* set overflow flag */
1767                 replay->overflow++;
1768
1769                 /* don't increment, no more packets accepted */
1770                 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
1771                         return 1;
1772
1773                 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n",
1774                     __func__, replay->overflow, ipsec_logsastr(sav)));
1775         }
1776
1777         replay->count++;
1778
1779         return 0;
1780 }
1781
1782 /*
1783  * shift variable length buffer to left.
1784  * IN:  bitmap: pointer to the buffer
1785  *      nbit:   the number of to shift.
1786  *      wsize:  buffer size (bytes).
1787  */
1788 static void
1789 vshiftl(bitmap, nbit, wsize)
1790         unsigned char *bitmap;
1791         int nbit, wsize;
1792 {
1793         int s, j, i;
1794         unsigned char over;
1795
1796         for (j = 0; j < nbit; j += 8) {
1797                 s = (nbit - j < 8) ? (nbit - j): 8;
1798                 bitmap[0] <<= s;
1799                 for (i = 1; i < wsize; i++) {
1800                         over = (bitmap[i] >> (8 - s));
1801                         bitmap[i] <<= s;
1802                         bitmap[i-1] |= over;
1803                 }
1804         }
1805
1806         return;
1807 }
1808
1809 /* Return a printable string for the IPv4 address. */
1810 static char *
1811 inet_ntoa4(struct in_addr ina)
1812 {
1813         static char buf[4][4 * sizeof "123" + 4];
1814         unsigned char *ucp = (unsigned char *) &ina;
1815         static int i = 3;
1816
1817         i = (i + 1) % 4;
1818         sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff,
1819             ucp[2] & 0xff, ucp[3] & 0xff);
1820         return (buf[i]);
1821 }
1822
1823 /* Return a printable string for the address. */
1824 char *
1825 ipsec_address(union sockaddr_union* sa)
1826 {
1827         switch (sa->sa.sa_family) {
1828 #if INET
1829         case AF_INET:
1830                 return inet_ntoa4(sa->sin.sin_addr);
1831 #endif /* INET */
1832
1833 #if INET6
1834         case AF_INET6:
1835                 return ip6_sprintf(&sa->sin6.sin6_addr);
1836 #endif /* INET6 */
1837
1838         default:
1839                 return "(unknown address family)";
1840         }
1841 }
1842
1843 const char *
1844 ipsec_logsastr(sav)
1845         struct secasvar *sav;
1846 {
1847         static char buf[256];
1848         char *p;
1849         struct secasindex *saidx = &sav->sah->saidx;
1850
1851         IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
1852                 ("address family mismatch"));
1853
1854         p = buf;
1855         snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
1856         while (p && *p)
1857                 p++;
1858         /* NB: only use ipsec_address on one address at a time */
1859         snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
1860                 ipsec_address(&saidx->src));
1861         while (p && *p)
1862                 p++;
1863         snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
1864                 ipsec_address(&saidx->dst));
1865
1866         return buf;
1867 }
1868
1869 void
1870 ipsec_dumpmbuf(m)
1871         struct mbuf *m;
1872 {
1873         int totlen;
1874         int i;
1875         u_char *p;
1876
1877         totlen = 0;
1878         printf("---\n");
1879         while (m) {
1880                 p = mtod(m, u_char *);
1881                 for (i = 0; i < m->m_len; i++) {
1882                         printf("%02x ", p[i]);
1883                         totlen++;
1884                         if (totlen % 16 == 0)
1885                                 printf("\n");
1886                 }
1887                 m = m->m_next;
1888         }
1889         if (totlen % 16 != 0)
1890                 printf("\n");
1891         printf("---\n");
1892 }
1893
1894 static void
1895 ipsec_attach(void)
1896 {
1897         SECPOLICY_LOCK_INIT(&ip4_def_policy);
1898         ip4_def_policy.refcnt = 1;                      /* NB: disallow free */
1899 }
1900 SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL)
1901
1902
1903 /* XXX this stuff doesn't belong here... */
1904
1905 static  struct xformsw* xforms = NULL;
1906
1907 /*
1908  * Register a transform; typically at system startup.
1909  */
1910 void
1911 xform_register(struct xformsw* xsp)
1912 {
1913         xsp->xf_next = xforms;
1914         xforms = xsp;
1915 }
1916
1917 /*
1918  * Initialize transform support in an sav.
1919  */
1920 int
1921 xform_init(struct secasvar *sav, int xftype)
1922 {
1923         struct xformsw *xsp;
1924
1925         if (sav->tdb_xform != NULL)     /* previously initialized */
1926                 return 0;
1927         for (xsp = xforms; xsp; xsp = xsp->xf_next)
1928                 if (xsp->xf_type == xftype)
1929                         return (*xsp->xf_init)(sav, xsp);
1930         return EINVAL;
1931 }